Pebble-mill.



PATENTBD JAN. 2z, v1907.

2 SHEETS-SHEET 1;

QN y INN; a ,l

f. mw, 5

rNo'. 841,913;

UNITED STATES.

PATENT oEEIoE.

MAX F. ABB, OF NEW YORK, N. Y.

PEBBLE-MILL.

Specication of Letters Patent. vimplication filed May 2, 1906. Serial No. 314.791.

To all whom t may concern:

Be it. known that I, MAX F. ABBE, a citizen i of the United States, residing at New York city, Manhattan, county and Stateof New kYork, have invented 'new and useful Imrovements in Pebble-Mills, of owing is a specification.

This invention relates to an improved pebbl'efmill, and more particularly to improved meansfor-feeding the ulp or other material to be ground to the'redlilcing-cylinder.

By my invention the feeding mechanism which the folconstitutes an attachment which is mounted exterior to the reducing-cylinder and com-l municates therewith by means of a hollow trunnion.. The advantages of this construction are that the feeding device maybe coupled to dillerent forms of existing mills With-v out changing their construction and that it may be readily re 'aired or re laced without opening the cylin er or distur ,ing its lining.

l In the accompanying. drawings, Figure 1 is a vertical longitudinal section through my mill with they' bulk of the pebbles andthe feed-regulator omitted; 2, an enlarged section through the eeder;'and Fig. 3 a crosssection on line 3 3, Fig. 2. y

The cylindrical bod 4 of the mill is lined, as at 5, and is provide With hollow trunnions 6 and 7. These trunnions turn in bearings` 8 and 9 supported on the fcundation-V iers 10. Cylinder 4 contains the reducing e bles or balls 11 and is rotated by means cip a circumferential toothed wheel l2,` intergeared-with the driving mechanism.- )(Not shown.) Ol- 1 .posite to inlet-trunnion 6and outside of cy 1nder4'there is mounted upon 'a step 13 oi pier a stationary feed-chamber 14, adapted to receive by feedipe 15 thepulp or other material to be ground? these the innermost convolute is extended laterally to constituteja dischargetube 17,. projecting out'of chamber 14. i The ianged.y end 18 oi' this tube maybe removably cou` pled to the flanged outer end 19 of trunnion y bolts 20 or otherwise, so that the rotary movement :of` cylinder 4 is by .trunnions 6 and tube 7 transmitted to yconveyer 16. It

Chamber 14 contains a rotatable s iral conveyerl, having ,convolutes of gra ual1y-increasing-diameters.. Of-

regulating the quantity 'of l"pulp fed to the mill. These means consist of an inlet-valve 21 in the feed-pipe 15 to the plug 22 of which is attached a two-arm lever 23. One arm of this lever carries an adjustable counterweight 24, while'v its other arm is v ratentea @11.22, 19o7.r

slotted, as at 25.v `Slot 25 admitsa pin 26,

projecting from'theupper end of a rod 27,

' which passes vinto a pocket 28 of chamber 14.

The low r end of rod 27 carries a float 29, influenced by the liquid contents 300i chamber 14. When the milow of the pulp unduly increases, the vrising float will partly-close` valve 21, while when the inflow of the ulp unduly diminishes Athe valve 21 will) be opened` by the descent of the ioat.

The discharge end of the mill does not constitute art ofthe present invention.

It wi be seen that the feeder comprising .the chamber 14 and conveyer 16 are arranged entirely outside of the mill proper, and that they may be inspected, repaired, or replaced withoutopening the mill or interfering with its dining. "In this .way time is eoonomized. and labor saved, While, furthermore, the feeder may lbe coupled to various existing mills without changmg their construction.A

-What I claim is- 1. A pebble-mill provided with a reducing als c 'linder having a hollow trunnion, a stationary feed-chamber exterior to the cylinder,

a spiral conveyer rotatable within said cham- 5 ber and `having convolutes of gradually-de# -creasing diameter, `a discharge-tube extend- -ingfrorn theinnermost convolute out of said chamber, ,and means for connecting said tube to the outer end of the trunnion, substan-A tially as specified` loov -oock controlling said pipe, a float in the feed- 2. Apebble-mill provided with areduoing-v "meeting said float to the cock, substantially cylinder havingr a hollow' trunnion, a, feedas specied. chamber exterior to the cylinder, an inclosed`v Signed by me at New York nity, (Manrotatable spiral eonveyer, means for conhatten) New York, this lstday of May, 1906. meeting saidvconveyer to the hollow trunnion, MAX- E ABBE a feed-pipe entering the feed-chamber, a

Witnesses FRANK V. BRIESEN chamber, and means for operatively oon- WILLIAM SCHULZ 

